Screw-down mechanism for rolling-mills.



Patented Oct. 13,1908.

E. J. MOILVRIED. SCREW DOWN MECHANISM FOR ROLLING MILLS. APPLICATIONFILED AUG. 8, 1907.

WITNESSES E. J. MOILVRIED. SCREW DOWN MEGHANISM FOB ROLLING MILLS.APPLICATION nun AUG. a, 1907.

E. I. MoILVRIED. SCREW DOWN MECHANISM FOR ROLLING MILLS.

APPLICATION FILED AUG.8, 1907. 9O 1 ,25 1 Patented Oct. 13, 1908. 8SHEBTB-BHEET 3.

INVENTOR a (g h gq W nn Down Mechanism for Rollin -Mills, of

' mechanism. Incidents of this kind may UNITED s'rA'rss PATENT OFFICE.

IIUWI N J. Mel [N [U I51), ()I" ll'lTSBU RU, ll'lN NSYLVAN 1A, ASSIGNOR'lU UN l'll'll) ENGINEERING dz FOUNDRY COMPANY, 01" I'I'VPSBU'RG,PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

Specification of Letters Patent.

l atented Oct. 13, 1908.

Application filed August 8, 1907. Serial No. 887,822.

To all whom it may concern:

Be it known that l, EDWIN J. Mcl nvmnn, of Pittsburg, Alle heny county,PennsyL- vania, have invents a new and useful Screwwhich the followin isa full, c ear, and exact description, re erence being had to theaccompan ing drawings, forming part of this speci cation, in whichFigure 1 is a front elevation, partly in section, of a portion of arolling mill embodying one form of my invention; Fig. 2 is a plan viewof the same; and Fig. 3 is a side elevation partly broken away.

In the operation of rolling mills, articularly three-high mills, itfrequently iappens that there occurs what is termed in rolling millpractice a sticker, that is to say, the thin piece or shape which isbeing rolled becomes wedged so tightly between two of the rolls as tocause a jam, which locks the holding-down screws to such an extent thatthey cannot be released by the ordinary releasing cause the destructionof the rolls, or other serious injury to the mill.

The ob ect of my invention is to provide means supplemental to the usualscrew-down mechanism which can be quickly broughtinto action when asticker occurs, to release the jam and permit the rolls to be separated.

In carryin out my invention, the nuts or boxes in which the usualholding-down screws are seated, or have their bearings, are made capableof a vertical movement in the roll housings, and power means areprovided for raising the same, together with the holding-down screws,when a sticker occurs, thereby releasing the screws and permitting theusual releasing mechanism to operate thereon.

The precise nature of my invention will be best understood by referenceto the accompanying drawings, in which I have shown one embodimentthereof, it being premised, however, that various changes may be madetherein by those skilled in the art, without departing from the spiritand scope of my invention, as defined in the appended claims.

In these drawings, the numeral 2 designates the roll housings, 3 thelower roll, 4 the vertically movab e middle roll having suitableactuating mechanism 5, and 6 the upper roll, of a t res-high mill.

7 desi nates the usual holding-down screws, w ich engage the movableboxes or bearings 8, of the upper roll 6. These screws may be actuatedin any suitable or usual manner. In the drawings 1 have shown themactuated by means of worm wheels 9, through which the holding-downscrews are vertically movable, and which are actuated by worms 10 on ashaft 11. The shaft 11 may be actuated by an electric or other suitablemotor 12 through the gearing 13 and 14. The holdin -down screws 7 have abearing in threaded oxes 16, which are movably seated in the upperportion of the roll housings.v These nuts or bo'xes have each a nut 17threaded onto their upper ends, and are formed with a lower portion 18of increased diameter, the upper surface of the shoulder formed by theenlargement being helicoidal and designed to engage a correspondingsurface 19 in the roll housing. This surface may be conveniently rovidedby inserting and securing a ring within the housing, as shown in Fig. 3,although such surface may be an integral art of the housing. Thesehelicoidal sur aces are in the same direction as the threads on theholdingdowli: screws, but are of considerably greater pitc Fitted uponan angular portion 20 of each of the nuts or boxes is a wrench hub 21having an extending arm 22. The outer ends of these arms have loose balland socket engagements 23 with slides 24 mounted on the upper portion ofthe roll housings in guides 25 so as to move in a'direction parallel tothe axis of the rolls. These slides are covered by cap plates 26, one ofwhich is shown )artially broken away in Fi 2. The two s ides 24 areconnected -a r or bar 27 to move in unison. The s ides 24 are actuatedb' means of a screw-shaft 28, which is arrange to move through a gearwheel 29 which is driven by a motor 30 through the gearing 31. The gearwheel 29 is mounted within the frame in such a manner as to be heldagainst endwise movement, as it is rotated, so that when rotated anendwise movement of the shaft 28 and thereby of the two sleeves 24. iseffected.

The (g ration of the invention is as follows: on a sticker occurs andthe holding-down screw 7 cannot be operated by the motor 12 owing'tothejamm'ing of the parts, the operator immediately starts the motor 30.This actuates the shaft 28 and moves the two slides 24, thereby turningthe wrench arms 22. This causes the rotation of the nuts or boxes 16,and the helicoidal surfaces thereon move on the corresponding surfaces19, thereby raising the boxes and the holding-down screws therewith. Aslight movement of this character will obviously release the holdin-down screws and the motor 12 immediate y commences to operate them. Themotor 30 is then reversed to return the boxes to their normal positions.

The advantages of my invention result from the effective manner in whichthe holding-down screws can be released when the sticker occurs, therebypreventing injury to the rolls and mill.

The improvement can be readily applied to existing mills, and providesan exceedingly simple and effective way of overcomin the difficultiesheretofore experienced.

t will be obvious that various means may be provided for moving the nutsor boxes to release the holding-down screws; that various motive devicesmay be employed for the purpose, and that various other changes mav bemade in the details of construction an arrangement.

What I claim is 1. In a rollin mill, the combination of screw-down mecanism for the upper roll, and havin vertically movable boxes ornuts forthe ho ding-down screws, a motive device, and connections between themotive device and the nuts for actuating the same and thereby the screwsindependently of their usual actuating mechanism, substantially asdescribed.

2. In a rolling mill 9. holding-down screw, a box or nut therefor havinga threaded bearing in the housing of the mill, a motive device, andconnections between the motive device and the nut for rotating thelatter on its threaded bearing, sul'istantially as described.

3. In screw-down mechanism for rolling mills, a holding-down screw, anda vertically movable box or nut therefor havin a helicoidal surfacethereon, the roll housing in which the box or nut is seated having abearing surface of complementary form. a motive device, and operatinconnections between the motive device an the box or nut for rotating thelatter, substantially as described.

4. In screw-down mechanism for rolling mills, a holding-down screw, avertically movable box or nut therefor having a helicoidal bearing inthe roll housin in which it is seated, a wrench arm attac ed to the boxor nut, a motive device, and actuatin connections between the motivedevice an the wrench arm; substantially as described.

5. I11 a rolling mill, a pair of holdingdown screws, nuts or boxes forsaid screws arranged to have a vertical and rotary movement in the rollhousings, wrench arms connected to the boxes or nuts, connected slidesengaging said arms, and a motive device for actuating the slides;substantially as described.

6. In a rollin mill, the combination of screw-down mechanism for theupper roll, vertically movable boxes or nuts for the said screws, andmeans for normally holding the boxes or nuts against movement, and meansconnected with the boxes or nuts for lifting them when desired;substantially as described.

In testimony whereof, 'I have hereunto set my hand.

EDWIN J. MoILVRIED. \Vitnesses:

H. M. Conwm, LAURENCE H. Lian.

